One monitor flickering in 4 monitor setup

Hello,

I have a weird problem with my 4 monitor setup. Here my setup and some basic information.

inxi -Fza

System:    Kernel: 5.14.18-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.14-x86_64 root=UUID=028ed5bf-7a36-406b-b781-10ae62408e41 rw quiet
           resume=UUID=14640b8a-bd13-4b61-adb4-53a8d09ffdfa udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff amdgpu.audio=0
           Desktop: KDE Plasma 5.23.3 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM Distro: Manjaro Linux base: Arch Linux
Machine:   Type: Desktop System: Hewlett-Packard product: HP Z420 Workstation v: N/A serial: <superuser required> Chassis:
           type: 6 serial: <superuser required>
           Mobo: Hewlett-Packard model: 1589 v: 0.00 serial: <superuser required> UEFI: Hewlett-Packard v: J61 v03.96
           date: 10/29/2019
CPU:       Info: 6-Core model: Intel Xeon E5-1650 v2 bits: 64 type: MT MCP arch: Ivy Bridge family: 6 model-id: 3E (62)
           stepping: 4 microcode: 42E cache: L1: 384 KiB L2: 1.5 MiB L3: 12 MiB
           flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 83821
           Speed: 2186 MHz min/max: 1200/3900 MHz Core speeds (MHz): 1: 3411 2: 2576 3: 2626 4: 2134 5: 2465 6: 2595 7: 2844
           8: 2704 9: 3098 10: 2368 11: 2694 12: 3452
           Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
           Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable
           Type: mds mitigation: Clear CPU buffers; SMT vulnerable
           Type: meltdown mitigation: PTI
           Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
           Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling
           Type: srbds status: Not affected
           Type: tsx_async_abort status: Not affected
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] vendor: ASUSTeK
           driver: amdgpu v: kernel bus-ID: 04:00.0 chip-ID: 1002:67df class-ID: 0300
           Device-2: Microdia Dual Mode Camera (8006 VGA) type: USB driver: hid-generic,usbhid bus-ID: 3-2.1.2:6
           chip-ID: 0c45:8006 class-ID: 0301
           Display: x11 server: X.Org 1.21.1.1 compositor: kwin_x11 driver: loaded: amdgpu display-ID: :0 screens: 1
           Screen-1: 0 s-res: 9117x3600 s-dpi: 96 s-size: 2410x951mm (94.9x37.4") s-diag: 2591mm (102")
           Monitor-1: DisplayPort-0 res: 5120x2160 hz: 60 dpi: 163 size: 800x330mm (31.5x13.0") diag: 865mm (34.1")
           Monitor-2: HDMI-A-0 res: 2560x1440 hz: 60 dpi: 123 size: 527x296mm (20.7x11.7") diag: 604mm (23.8")
           Monitor-3: DVI-D-0 res: 2560x1440 hz: 60 dpi: 123 size: 527x296mm (20.7x11.7") diag: 604mm (23.8")
           Monitor-4: DVI-D-1 res: 1440x2560 hz: 60
           OpenGL: renderer: AMD Radeon RX 470 Graphics (POLARIS10 DRM 3.42.0 5.14.18-1-MANJARO LLVM 13.0.0)
           v: 4.6 Mesa 21.2.5 direct render: Yes
Audio:     Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] vendor: ASUSTeK driver: snd_hda_intel
           v: kernel bus-ID: 04:00.1 chip-ID: 1002:aaf0 class-ID: 0403
           Device-2: Samson Meteor condenser microphone type: USB driver: hid-generic,snd-usb-audio,usbhid bus-ID: 2-1.1.4:6
           chip-ID: 17a0:0310 class-ID: 0300
           Sound Server-1: ALSA v: k5.14.18-1-MANJARO running: yes
           Sound Server-2: JACK v: 1.9.19 running: no
           Sound Server-3: PulseAudio v: 15.0 running: yes
           Sound Server-4: PipeWire v: 0.3.40 running: no
Network:   Device-1: Intel 82579LM Gigabit Network vendor: Hewlett-Packard driver: e1000e v: kernel port: f040 bus-ID: 00:19.0
           chip-ID: 8086:1502 class-ID: 0200
           IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter>
           Device-2: Realtek RTL8169 PCI Gigabit Ethernet driver: r8169 v: kernel port: c000 bus-ID: 06:04.0
           chip-ID: 10ec:8169 class-ID: 0200
           IF: enp6s4 state: up speed: 1000 Mbps duplex: full mac: <filter>
Bluetooth: Device-1: ASUSTek ASUS USB-BT500 type: USB driver: btusb v: 0.8 bus-ID: 3-4:3 chip-ID: 0b05:190e class-ID: e001
           serial: <filter>
           Report: rfkill ID: hci0 rfk-id: 0 state: down bt-service: enabled,running rfk-block: hardware: no software: yes
           address: see --recommends
Drives:    Local Storage: total: 3.18 TiB used: 1.26 TiB (39.8%)
           SMART Message: Unable to run smartctl. Root privileges required.
           ID-1: /dev/sda maj-min: 8:0 vendor: Crucial model: CT500MX500SSD1 size: 465.76 GiB block-size: physical: 4096 B
           logical: 512 B speed: 6.0 Gb/s type: SSD serial: <filter> rev: 023 scheme: GPT
           ID-2: /dev/sdb maj-min: 8:16 vendor: SanDisk model: SDSSDH3500G size: 465.76 GiB block-size: physical: 512 B
           logical: 512 B speed: 6.0 Gb/s type: SSD serial: <filter> rev: 70RL scheme: GPT
           ID-3: /dev/sdc maj-min: 8:32 vendor: Kingston model: SA400S37240G size: 223.57 GiB block-size: physical: 512 B
           logical: 512 B speed: 3.0 Gb/s type: SSD serial: <filter> rev: B1D1 scheme: GPT
           ID-4: /dev/sdd maj-min: 8:48 vendor: Seagate model: ST1000DX001-1CM162 size: 931.51 GiB block-size:
           physical: 4096 B logical: 512 B speed: 3.0 Gb/s type: HDD rpm: 7200 serial: <filter> rev: CC62 scheme: GPT
           ID-5: /dev/sde maj-min: 8:64 vendor: Seagate model: ST1000DX001-1CM162 size: 931.51 GiB block-size:
           physical: 4096 B logical: 512 B speed: 3.0 Gb/s type: HDD rpm: 7200 serial: <filter> rev: CC43 scheme: GPT
           ID-6: /dev/sdf maj-min: 8:80 vendor: SanDisk model: SDSSDHP256G size: 238.47 GiB block-size: physical: 512 B
           logical: 512 B speed: <unknown> type: SSD serial: <filter> rev: 6RL scheme: GPT
Partition: ID-1: / raw-size: 238.22 GiB size: 233.48 GiB (98.01%) used: 31.99 GiB (13.7%) fs: ext4 dev: /dev/sdf1
           maj-min: 8:81
           ID-2: /boot/efi raw-size: 250 MiB size: 246.1 MiB (98.46%) used: 299 KiB (0.1%) fs: vfat dev: /dev/sdf2
           maj-min: 8:82
           ID-3: /home raw-size: 883.51 GiB size: 868.64 GiB (98.32%) used: 823.4 GiB (94.8%) fs: ext4 dev: /dev/sdd2
           maj-min: 8:50
Swap:      Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
           ID-1: swap-1 type: partition size: 48 GiB used: 0 KiB (0.0%) priority: -2 dev: /dev/sdd1 maj-min: 8:49
Sensors:   System Temperatures: cpu: 38.0 C mobo: N/A gpu: amdgpu temp: 44.0 C
           Fan Speeds (RPM): N/A gpu: amdgpu fan: 1477
Info:      Processes: 289 Uptime: 6m wakeups: 0 Memory: 31.29 GiB used: 2.75 GiB (8.8%) Init: systemd v: 249 tool: systemctl
           Compilers: gcc: 11.1.0 clang: 13.0.0 Packages: 1427 pacman: 1411 lib: 414 flatpak: 16 Shell: Bash v: 5.1.8
           running-in: konsole inxi: 3.3.09

DISPLAY=:0 xrandr --prop
Screen 0: minimum 320 x 200, current 9117 x 3600, maximum 16384 x 16384
DisplayPort-0 connected 5120x2160+2558+1440 (normal left inverted right x axis y axis) 800mm x 330mm
        EDID: 
                00ffffffffffff003669a13d01010101
                161d0104b55021789e19c5ae5044af26
                0e5054210800714081c0810081408180
                a900b300d1c0e77c70a0d0a029503058
                3a00204a3100001e000000fd00303d1e
                874c000a202020202020000000fc004d
                534920505333343157550a20000000ff
                0030303030303030303030303030029c
                02032cf15401020304051013141f2021
                225d5e5f60617b7d7e23090707830100
                00e6060701737300e305e3019d6770a0
                d0a0225030203a00204a3100001e08e8
                0030f2705a80b0588a00204a3100001e
                303e70a0d0a0225030203a00204a3100
                001e0000000000000000000000000000
                0000000000000000000000000000008a
                70133f000003013c6f1d0186ff136801
                188060006f083d002f000800dded0006
                ff136801188060006f083d001b000800
                b88e0006ff136801188060006f083d00
                1b0008004d0000000000000000000000
                00000000000000000000000000000000
                00000000000000000000000000000000
                00000000000000000000000000000090
        GAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        DEGAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        GAMMA_LUT: 0 
                range: (0, 65535)
        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
                0 1 
        DEGAMMA_LUT: 0 
                range: (0, 65535)
        TearFree: on 
                supported: off, on, auto
        subconnector: Native 
                supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
        vrr_capable: 0 
                range: (0, 1)
        max bpc: 8 
                range: (8, 16)
        underscan vborder: 0 
                range: (0, 128)
        underscan hborder: 0 
                range: (0, 128)
        underscan: off 
                supported: off, on, auto
        scaling mode: None 
                supported: None, Full, Center, Full aspect
        link-status: Good 
                supported: Good, Bad
        CONNECTOR_ID: 65 
                supported: 65
        non-desktop: 0 
                range: (0, 1)
   5120x2160     60.00*+  60.00    50.00    59.94    50.00    30.00    29.97    30.00  
   3440x1440     59.97 +  49.99    30.00  
   3840x2160     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1920x1200     60.00  
   1920x1080     60.00    60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1600x1200     60.00  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      60.00  
   1280x960      60.00  
   1280x800      59.81  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI-A-0 connected primary 2560x1440+0+1440 (normal left inverted right x axis y axis) 527mm x 296mm
        EDID: 
                00ffffffffffff00047243057f227082
                1b1c010380351e782ee165a45753a027
                0d5054bfef80714f8140818081c08100
                9500b300d1c0565e00a0a0a029503020
                35000f282100001a000000fd0038901f
                de3c000a202020202020000000fc0058
                4632343059550a2020202020000000ff
                005437314545303031383532310a01a5
                020337f1519005040302011112131406
                0715161f205a23090707830100006703
                0c002000384467d85dc401788000681a
                000001012890e69ee80078a0a0675008
                2098040f282100001a023a801871382d
                40582c45000f282100001acd4600a0a0
                381f4030203a000f282100001a6fc200
                a0a0a05550302035000f282100001a9a
        GAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        DEGAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        GAMMA_LUT: 0 
                range: (0, 65535)
        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
                0 1 
        DEGAMMA_LUT: 0 
                range: (0, 65535)
        TearFree: on 
                supported: off, on, auto
        vrr_capable: 0 
                range: (0, 1)
        max bpc: 8 
                range: (8, 16)
        underscan vborder: 0 
                range: (0, 128)
        underscan hborder: 0 
                range: (0, 128)
        underscan: off 
                supported: off, on, auto
        scaling mode: None 
                supported: None, Full, Center, Full aspect
        link-status: Good 
                supported: Good, Bad
        CONNECTOR_ID: 71 
                supported: 71
        non-desktop: 0 
                range: (0, 1)
   2560x1440     59.95*+ 144.01   120.00  
   2560x1080     60.00    59.94    59.98  
   1920x1200     59.95  
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98  
   1600x1200     59.95  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DVI-D-0 connected 2560x1440+5117+0 (normal left inverted right x axis y axis) 527mm x 296mm
        EDID: 
                00ffffffffffff0009d11b8045540000
                2b1e010380351e782e0cd5a9554ca125
                0d5054a56b80818081c08100a9c0b300
                d1c001010101565e00a0a0a029503020
                35000f282100001a000000ff004c414c
                30323038383031390a20000000fd0032
                4c1e591b000a202020202020000000fc
                0042656e51204c43440a202020200034
        GAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        DEGAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        GAMMA_LUT: 0 
                range: (0, 65535)
        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
                0 1 
        DEGAMMA_LUT: 0 
                range: (0, 65535)
        TearFree: on 
                supported: off, on, auto
        max bpc: 8 
                range: (8, 16)
        underscan vborder: 0 
                range: (0, 128)
        underscan hborder: 0 
                range: (0, 128)
        underscan: off 
                supported: off, on, auto
        scaling mode: None 
                supported: None, Full, Center, Full aspect
        link-status: Good 
                supported: Good, Bad
        CONNECTOR_ID: 76 
                supported: 76
        non-desktop: 0 
                range: (0, 1)
   2560x1440     59.95*+
   1920x1200     59.95  
   1920x1080     60.00  
   1600x1200     59.95  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.95  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DVI-D-1 connected 1440x2560+7677+1040 left (normal left inverted right x axis y axis) 527mm x 296mm
        EDID: 
                00ffffffffffff0009d11b8045540000
                251e010380351e782e0cd5a9554ca125
                0d5054a56b80818081c08100a9c0b300
                d1c001010101565e00a0a0a029503020
                35000f282100001a000000ff0038394c
                30353330353031390a20000000fd0032
                4c1e591b000a202020202020000000fc
                0042656e51204c43440a20202020005b
        GAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        DEGAMMA_LUT_SIZE: 4096 
                range: (0, -1)
        GAMMA_LUT: 0 
                range: (0, 65535)
        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
                0 1 
        DEGAMMA_LUT: 0 
                range: (0, 65535)
        TearFree: on 
                supported: off, on, auto
        max bpc: 8 
                range: (8, 16)
        underscan vborder: 0 
                range: (0, 128)
        underscan hborder: 0 
                range: (0, 128)
        underscan: off 
                supported: off, on, auto
        scaling mode: None 
                supported: None, Full, Center, Full aspect
        link-status: Good 
                supported: Good, Bad
        CONNECTOR_ID: 80 
                supported: 80
        non-desktop: 0 
                range: (0, 1)
   2560x1440     59.95*+
   1920x1200     59.95  
   1920x1080     60.00  
   1600x1200     59.95  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.95  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
dmesg | grep amdgpu

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.14-x86_64 root=UUID=028ed5bf-7a36-406b-b781-10ae62408e41 rw quiet resume=UUID=14640b8a-bd13-4b61-adb4-53a8d09ffdfa udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff amdgpu.audio=0
[    0.062935] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.14-x86_64 root=UUID=028ed5bf-7a36-406b-b781-10ae62408e41 rw quiet resume=UUID=14640b8a-bd13-4b61-adb4-53a8d09ffdfa udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff amdgpu.audio=0
[    4.607484] [drm] amdgpu kernel modesetting enabled.
[    4.607594] amdgpu: CRAT table not found
[    4.607598] amdgpu: Virtual CRAT table created for CPU
[    4.607607] amdgpu: Topology: Add CPU node
[    4.607675] fb0: switching to amdgpudrmfb from EFI VGA
[    4.607723] amdgpu 0000:04:00.0: vgaarb: deactivate vga console
[    4.607816] amdgpu 0000:04:00.0: amdgpu: Trusted Memory Zone (TMZ) feature not supported
[    4.608018] amdgpu 0000:04:00.0: Invalid PCI ROM data signature: expecting 0x52494350, got 0xe808aa55
[    4.608037] amdgpu 0000:04:00.0: amdgpu: Fetched VBIOS from ROM BAR
[    4.608039] amdgpu: ATOM BIOS: 115-D000PI20-100
[    4.609914] amdgpu 0000:04:00.0: BAR 2: releasing [mem 0xe0000000-0xe01fffff 64bit pref]
[    4.609918] amdgpu 0000:04:00.0: BAR 0: releasing [mem 0xd0000000-0xdfffffff 64bit pref]
[    4.609941] amdgpu 0000:04:00.0: BAR 0: no space for [mem size 0x100000000 64bit pref]
[    4.609942] amdgpu 0000:04:00.0: BAR 0: failed to assign [mem size 0x100000000 64bit pref]
[    4.609944] amdgpu 0000:04:00.0: BAR 2: no space for [mem size 0x00200000 64bit pref]
[    4.609945] amdgpu 0000:04:00.0: BAR 2: failed to assign [mem size 0x00200000 64bit pref]
[    4.609975] amdgpu 0000:04:00.0: BAR 0: assigned [mem 0xd0000000-0xdfffffff 64bit pref]
[    4.609980] amdgpu 0000:04:00.0: BAR 2: assigned [mem 0xe0000000-0xe01fffff 64bit pref]
[    4.609991] amdgpu 0000:04:00.0: amdgpu: VRAM: 4096M 0x000000F400000000 - 0x000000F4FFFFFFFF (4096M used)
[    4.609994] amdgpu 0000:04:00.0: amdgpu: GART: 256M 0x000000FF00000000 - 0x000000FF0FFFFFFF
[    4.610033] [drm] amdgpu: 4096M of VRAM memory ready
[    4.610035] [drm] amdgpu: 4096M of GTT memory ready.
[    4.617562] amdgpu: hwmgr_sw_init smu backed is polaris10_smu
[    5.256985] kfd kfd: amdgpu: Allocated 3969056 bytes on gart
[    5.257095] amdgpu: SRAT table not found
[    5.257096] amdgpu: Virtual CRAT table created for GPU
[    5.257166] amdgpu: Topology: Add dGPU node [0x67df:0x1002]
[    5.257168] kfd kfd: amdgpu: added device 1002:67df
[    5.257186] amdgpu 0000:04:00.0: amdgpu: SE 4, SH per SE 1, CU per SH 9, active_cu_number 32
[    5.267261] fbcon: amdgpu (fb0) is primary device
[    5.267265] amdgpu 0000:04:00.0: [drm] fb0: amdgpu frame buffer device
[    5.308418] amdgpu 0000:04:00.0: amdgpu: Using BACO for runtime pm
[    5.308706] [drm] Initialized amdgpu 3.42.0 20150101 for 0000:04:00.0 on minor 0

I have this model link

It should be capable to drive 4 monitors. But the second monitor which is connected via DVI has a flickering issue. Both are connceted via a DVI-D Dual-Link cable. It switches between showing the picture and a black screen. After some time it stops but then the resolution has dropped to 1920x1080 even if KDE says it’s still 2560x1440. I have tried to search in the internet if someone has the same problem but I couldn’t find anything useful or what could be the cause. I don’t think it a hardware problem. If I put in a additional second AMD card (RX 460) and connect 3 monitors via it and one via the RX 470, I have still this issue but much lesser. So I think it’s have something to do with a software issue, but I don’t know which one. Maybe someone here has an idea, what I could check. And it seems when I reduce the resolution to 1920x1080 the behavior doesn’t appear.

Ok I did a video to show you what I mean and when it’s worst it’s like I described.

Flickering Monitor

Can you test:

  • Try switching from DVI to HDMI.
  • This monitor connects with RX470.

Can’t the RX 470 has only 1 Displayport, 1 HDMI and 2 DVI connectors.

You use 4 monitors using two GPUs:

Do you mean:
Before:

  • Connections of RX 460:

    • DVI-D : Monitor A has this issue.
    • HDMI: Monitor B, no issue.
    • DisplayPort:
  • Connections of RX 470:

    • DVI-D : Monitor C, no issue.
    • DVI-D:
    • HDMI:
    • DisplayPort: Main Monitor, no issue.

After:
You try to change:

  • Connections of RX 460:

    • DVI-D :
    • HDMI: Monitor B, no issue.
    • DisplayPort:
  • Connections of RX 470:

    • DVI-D : Monitor C, no issue.
    • DVI-D:
    • HDMI: Monitor A ← Does it work?
    • DisplayPort: Main Monitor, no issue.

There are many possible changes of port connection.


If different ports have the same issue with monitor A, this means that this monitor has the problem, not software’s issue.

No I think there is an missunderstanding.

I want to use only the RX 470:

Monitor A → Displayport
Monitor B → HDMI
Monitor C → DVI 1
Monitor D → DVI 2

But Monitor D can’t be used with full resolution and shows the behavior in linked video.

What work when I use RX 470 and RX 460 together:

Monitor A → Displayport RX 460
Monitor B → Displayport RX 470
Monitor C → HDMI RX 460
Monitor D → DVI RX 460

All monitors can be used with full reslotuion.

So I want to figure out why Monitor D can’t be used with full resolution when I use the RX 470 only. Is there a software issue or maybe a hardware limitation after all? I couldn’t find an answer so far. AMDs information about Eyefinity are very limited. I think there should be no hardware limitation. So maybe someone have an idea here how to figure out if it is a software issue.

Did you try to switch two monitors C and D with RX470?

Monitor D → DVI 1
Monitor C → DVI 2

what happens it?


Remove monitor B:

Monitor A → Displayport
Monitor C → DVI 1
Monitor D → DVI 2

What happens it?

Did you mean:

Monitor A → Displayport RX 460
Monitor B → Displayport RX 470
Monitor C → DVI 1 RX 470
Monitor D → DVI 2 RX 470

?

When I remove Monitor B using only the RX 470 results in the same behavior.

I mean:

Monitor A → Displayport
Monitor B → HDMI
Monitor D → DVI 1
Monitor C → DVI 2
All connect with RX 470 (Only monitor C and D are exchanged.).

Ok same behavior too.

Monitor D is probably defective.


One last try:

Monitor A → Displayport
Monitor D → HDMI
Monitor C → DVI 1

All connect with RX 470

If Monitor D has the same issue, it is indeed damaged.
If no, the port DVI-D of monitor D is damaged.

With HDMI I get full resolution in Monitor D. I checked it also with my laptop via HDMI
and I have full resolution too. I have a DVI to HDMI adapter I tried to with Monitor D but it seems it isn’t a proper adapter (it seems to support only 1920x1080).

What I also tried.

RX 470
Monitor A → Displayport
Monitor B → HDMI
Monitor C → DVI

RX460
Monitor D → DVI

Same behavior. But when I change

RX 470
Monitor A → Displayport
Monitor B → HDMI
Monitor C → DVI

RX460
Monitor D → HDMI

I have full resolution on all monitors.
What I want to test now is to buy a proper DVI to HDMI adapter to connect Monitor D with it at the RX 470.

Ok I couldn’t find a proper adapter so I changed the configuration into:

Monitor A → Displayport RX 470
Monitor B → DVI 2 RX 470
Monitor C → DVI 1 RX 470
Monitor D → HDMI RX 470

And it works fine so far. So it seems indeed Monitor D has a problem with its DVI connector.